[Dnsmasq-discuss] Using IPv6 DHCP

Sean Boran sean at boran.com
Tue Sep 25 10:41:20 BST 2012


Hi,

On 25 September 2012 10:27, Simon Kelley <simon at thekelleys.org.uk> wrote:
> On 25/09/12 09:10, Sean Boran wrote:
>>
>> Hi,
>>
>> I'm doing sdome DHCPv6 tests and have a few questions :-)
>>
>> First is it is possible to disable v4 respond, and only respond to v6
>> requests? When testing I dont want to disturb a v4 dhcp already
>> running.  (e.g. should I set listen-address to my IPv6 address?)
>
>
> If you're happy to use the very latest code, then grab 2.64test5 and add
> dhcp-ignore=!DHCPv6
>
> to your configuration.

I also disable "enable-ra", since ra should not be needed, when using dhcp?


Sep 25 11:33:55 sisdns6 dnsmasq[9577]: started, version 2.64test5 cachesize 150
Sep 25 11:33:55 sisdns6 dnsmasq[9577]: compile time options: IPv6
GNU-getopt no-DBus no-i18n no-IDN DHCP DHCPv6 no-Lua TFTP no-conntrack
Sep 25 11:33:55 sisdns6 dnsmasq-dhcp[9577]: DHCPv6 stateless on
2001:918:ffcb:199::10
Sep 25 11:33:55 sisdns6 dnsmasq-dhcp[9577]: SLAAC on
2001:918:ffcb:199:: prefix valid 1d


>>
>> Secondly, I'm having issues assigning v6 addresses.
>>
>> compiled dnsmasq-2.63, config:
>> --
>> domain=mydomain.net
>> dhcp-range=2001:918:ffcb:199::10, 2001:918:ffcb:199::20, ra-stateless, 24h
>> dhcp-sequential-ip
>> enable-ra
>> dhcp-option=option6:dns-server,[::]
>> log-dhcp
>> --
>>
>
> Does the relevant interface have an address on the 2001:918:ffcb:199::
> subnet, and prefix length 64?

Yes.

 ifconfig
eth0      Link encap:Ethernet  HWaddr 00:50:56:83:3a:d4
          inet addr:10.90.199.11  Bcast:10.90.199.255  Mask:255.255.255.0
          inet6 addr: 2001:918:ffcb:199:fc54:9480:e886:e639/64 Scope:Global
          inet6 addr: 2001:918:ffcb:199:250:56ff:fe83:3ad4/64 Scope:Global
          inet6 addr: fe80::250:56ff:fe83:3ad4/64 Scope:Link


>
> Please could you try without the dhcp-sequential-ip option. That's unlikely
> to have been well tested for DHCPv6, and smells suspicious to me.
>
> Cheers,
>
> Simon.

Thanks done that, but no change really.

Sep 25 11:38:46 sisdns6 dnsmasq-dhcp[937]: 7022133 available DHCP
range: 2001:918:ffcb:199::10 -- 2001:918:ffcb:199::20
Sep 25 11:38:46 sisdns6 dnsmasq-dhcp[937]: 7022133 DHCPSOLICIT(eth0)
00:01:00:01:00:50:10:5a:de:08
Sep 25 11:38:46 sisdns6 dnsmasq-dhcp[937]: 7022133 requested options:
24:domain-search, 39:FQDN, 23:dns-server,
Sep 25 11:38:46 sisdns6 dnsmasq-dhcp[937]: 7022133 requested options:
31:sntp-server
Sep 25 11:38:46 sisdns6 dnsmasq-dhcp[937]: 7022133 tags: DHCPv6, eth0
Sep 25 11:38:46 sisdns6 dnsmasq-dhcp[937]: 7022133 sent size: 10
option:  1 client-id  00:01:00:01:00:50:10:5a:de:08
Sep 25 11:38:46 sisdns6 dnsmasq-dhcp[937]: 7022133 sent size: 14
option:  2 server-id  00:01:00:01:17:f2:f6:90:00:50:56:83:3a:d4
Sep 25 11:38:46 sisdns6 dnsmasq-dhcp[937]: 7022133 sent size: 40
option:  3 ia-na  IAID=1451433281 T1=0 T2=0
Sep 25 11:38:46 sisdns6 dnsmasq-dhcp[937]: 7022133 nest size: 24
option: 13 status  2 No addresses available
Sep 25 11:38:46 sisdns6 dnsmasq-dhcp[937]: 7022133 sent size: 16
option: 23 dns-server  2001:918:ffcb:199:fc54:9480:e886:e639

Regards,

Sean



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